Konvizi
Free No upload
Drop your CSV files: they are converted to JSON on your device, without uploading anything.
Drop your CSV files here
or
Your files stay on your device
Konvizi’s “CSV to JSON” tool is free, with no sign-up, no watermark and no file limit. All the processing happens in your browser, on your device: your files are never uploaded to a server, which makes it suitable for personal and confidential documents.
Drag your CSV files into the area above or click “Choose files”. You can add several at once.
Your browser reads each file and creates the matching JSON file. Nothing is sent over the internet.
Get your JSON files one by one, or all together with “Download all”.
CSV is a plain text file: each line is a table row, and columns are separated by commas or semicolons. It is the universal exchange format between spreadsheets, business software and databases.
Opened directly, a CSV often looks wrong: garbled accents, everything in one column, leading zeros gone. Converting it gives a file that is easier to read or reuse.
JSON is the data format of websites and apps: lists and objects written as text that programs read easily. It is what most APIs and technical exports return.
JSON can be used directly in a program, a website or an API: each table row becomes an object, with the column headers as field names.
Customer lists, accounting, software exports: your spreadsheets stay on your device and are shared with no third party, which makes GDPR compliance simpler. Accents and special characters are preserved, and the CSV separator matches your language.
Your files never leave your device. No upload, no storage.
No upload and no queue: the conversion starts right away.
As many files as you like, with no imposed size limit.
No sign-up, no watermark, no subscription.
| Konvizi | Typical online converter | |
|---|---|---|
| Where your files are processed | In your browser, on your device | On the service’s servers |
| Upload to the internet | None | Required, then you download the result |
| Storage of your files | None: nothing is stored | Stored on a server, at least while processing |
| Waiting time | Starts instantly | Upload time, sometimes a queue |
| Account | Never required | Often required beyond a few files |
| Watermark and limits | No watermark, no maximum number | Common on free plans |
Yes, completely. No sign-up, no watermark, no maximum number of files: you can convert as many files as you like.
No. Everything happens in your browser, on your device. Your files are never sent over the internet: nobody but you can see them.
A list of objects: the first CSV row gives the field names, and each following row becomes an object. Numbers are written as numbers and everything else as text; codes with a leading zero (“01234”) stay text.
It does not matter: Konvizi recognizes commas, semicolons, tabs and vertical bars. Quoted values, even with line breaks or separators inside, are read correctly.
Open your browser’s developer tools (F12 key), go to the “Network” tab and run a conversion: no request carries your file. The site also enforces a security rule (Content-Security-Policy) that forbids the browser from contacting any site other than konvizi.com, and konvizi.com is a static site with no service able to receive files.
Yes. Konvizi works in the browser of your phone or tablet (Safari, Chrome…) just like on a computer, with no app to install. Very large files are processed faster on a computer, which has more memory.